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FISH 4350 / 4380 Installation and Operation Manual26

NAVMAN

switching off other instruments, accessories

(e.g. bilge pump) and the motor until the

offending device is located. To stop

problems from electrical noise, try:

- re-routing the power and transducer

cable(s) away from the boat’s other

electrical wiring.

- routing the display unit’s power cable

directly to the battery with an in-line fuse.

4. Bottom is not displayed:

a) The Þ shÞ nder may have Manual Range

selected and the depth may be outside the

range value selected. Either change the

Þ shÞ nder to Auto Range or select another

depth range (see section 4-4 Range).

b) The depth may be outside the Þ shÞ nder’s

range. While in Auto Range, the display

unit will display “--.-” to indicate that there is

no bottom detected. A display of the bottom

should reappear when in shallower water.

5. The bottom is displayed too far up

the screen:

The Þ shÞ nder may have Manual Range

selected and the selected Range value is

too high for the depth. Either change the

Þ shÞ nder to Auto Range or select another

depth range (see section 4-4 Range).

6. Bottom echo disappears or erratic

digital reading while the boat is moving:

a) Ensure the back of the bottom surface

of the transducer is slightly lower than

the front and the front is as deep in the

water as possible in order to minimise the

generation of bubbles through cavitation.

(See the Transom Transducers Installation

Guide, for more information.)

b) The transducer may be in turbulent water.

Air bubbles in the water disrupt the echoes

returned, interfering with the Þ shÞ nder’s

ability to Þ nd the bottom or other targets.

This often happens when the boat is

reversed. The transducer must be mounted

in a smooth ß ow of water in order for the

Þ shÞ nder to work at all boat speeds.

c) Electrical noise from the boat’s motor

can interfere with the Þ shÞ nder. Try some

suppression spark plugs.

7. If the Þ shÞ nder beeps when turned on

but nothing is displayed:

The Þ shÞ nder may be operating, but the

backlight settings may have been set too

low. See section 2 Basic Operation, to adjust

the Þ shÞ nder backlight. (Press

twice)

8. The wrong language is displayed:

See section 3-1 Setup > System.

9. Fuel used or remaining seem inaccurate:

a) If the engine is run while the Þ shÞ nder is

powered off, the Þ shÞ nder does not record

the amount of fuel used during that engine

run. Consequently, the Fuel remaining

value will be higher than the actual amount

of fuel remaining in the tank.

To avoid this problem, use the Auto Power

Wiring option described in section 6-4 Wiring

options. This ensures that the fishfinder

powers on automatically whenever the

boat’s ignition is switched on.

b) In rough seas, fuel may surge back and

forth through the fuel transducer, resulting in

incorrect readings. Try installing a one-way

valve between the fuel transducer and the

fuel tank.

c) The Set remaining fuel value must be

reset after every refuelling (see section 3-3

Setup > Fuel).

d) The fuel tank may not reÞ ll to the same

capacity each time due to air pockets. This is

particularly noticable with underß oor tanks.

e) Fuel transducers wear out over time and

should be replaced after every 5000 litres

of fuel.

10. Flow indicates no fuel or low fuel:

a) Check that the number of engines is set

to 1. See section 3-3 Setup > Fuel.

b) Check that the fuel cable connectors are

securely plugged in and the collar is locked

in place. The collar must be locked in place

to give a watertight connection.

c) A fuel transducer may be clogged. If so,

remove the transducer from the fuel line

and gently blow through it in the opposite

direction to the fuel ß ow.

A fuel Þ lter between the fuel transducer

and the fuel tank must be installed as per

the fuel installation guide. Failure to do so

will void the warranty.

d) Inspect the fuel cable from end to end for

damage such as cuts, breaks, trapped or

squashed sections.

e) Check that the fuel Þ lter is clean.

11. A twin engine installation shows only

one ß ow rate:

a) Check that the number of engines is set

to 2. See section 3-3 Setup > Fuel.

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